灵芝, also known as Reishi mushroom or Ganoderma lucidum, is a type of fungus that has been used in traditional Chinese medicine for thousands of years. It is often referred to as the "mushroom of immortality" due to its reputed health benefits. 灵芝 is typically found growing on decaying wood and is characterized by its shiny, reddish-brown cap. This mushroom is believed to boost the immune system, reduce stress, and improve sleep quality. It is commonly consumed in the form of teas, powders, or capsules. While many people use 灵芝 for its potential health benefits, scientific research is ongoing to fully understand its effects and efficacy.